void LoadDS() { List <PhieuNhapDTO> dsPN = PhieuNhapBUS.GetDSPN(); dgvDSPN.DataSource = dsPN; for (int i = 0; i < dgvDSPN.Rows.Count; i++) { dgvDSPN.Rows[i].Cells[0].Value = i + 1; } btnThem.Enabled = true; btnSua.Enabled = true; txtMaNhap.Enabled = true; btnLuu.Enabled = false; }